well we know that we have 80mL and we also know that those 80mL will represent the "solute" or the 40% of the Tennessee whiskey total which we can say is 100%, so if 80 is the 40%, how much will it be for the 100% in mL?

Answer:
no it's not because is not

The given pair of angles are vertical opposite angle pair so, they are equal. i.e